A British Airways flight departing for Toronto made a precautionary return to London after reporting a technical problem on 3 September 2025.
British Airways flight BA99, operated by a Boeing 777-200, had conducted a departure from London Heathrow Airport.
The aircraft was performing a scheduled service bound for Toronto Pearson International Airport (YYZ).
British Airways BA99 London-Toronto
As the aircraft transited Welsh airspace, flight crew terminated the climb procedure at 15,000 feet. According to the online source Flight Emergency, the issue was an oxygen system problem.
Following the termination of the climb, flight crew elected to make a precautionary return to London Heathrow Airport.
A direct track for the departure airport was then initiated. The flight subsequently made a return landing on runway 27R London Heathrow Airport.
Flight & Aircraft Data
Flight data shows that British Airways flight BA99 had made a delayed departure from London Heathrow Airport at 6:38 PM local time on 3 September.
Scheduled time of departure for the service was listed as 5:15 PM local time.
Following its departure, flight BA99 had initially set course normally and had climbed to flight level FL150. Flight crew then terminated the climb procedure as the aircraft passed through Welsh airspace en route for Toronto.
The flight subsequently landed at the departure airport London Heathrow at 8:10 PM local time.
The aircraft conducting the BA99 service to Toronto Pearson International Airport (YYZ) was a Boeing 777-200, registered G-YMMJ. This is a 24.8 year old widebody aircraft belonging to the national carrier British Airways.
It has been in operational service with the airline since its initial delivery from the factory in December 2000.
